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hi. I am a rails newbie. I have am Model user with name and email. How can I acces and modify the param email before user.save? <% form_for :user do |f| -%> <p><label for="name">Username:</label><br/> <%= f.text_field :name %></p> <p><label for="email">Email</label><br/> <%= f.text_field :email